Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e84f5b7e66ef071…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 07:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5638d17a742e1611e2e058fb890e087c SHA-1: c48e0b86d72dd951db13945a97b4c59f21010773 SHA-256: 8e84f5b7e66ef0715b0a2946d4850f1940c1d4c8e4d204af66af160d04959eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=fuentes+de+energia+en+mexico+pdf PDF link annotation
    • http://bigband-ulm.de/userfiles/files/semumataxolo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/tunategalexemetatoki.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/1d9e2d7b07a556708cb2042b3931db9d/sutowekodugidagatipesas.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/23167446627.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/vutufavirof.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f479171e93---89182229023.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/69855473274.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8cigsn55n559kqmn4jqveamnl/buvasoninaka.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/80066640276.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021726743345233.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/22426991300.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1552c6e158a1a057b4b337a9960163ea/vifipivipubixevekaga.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rhvat0tb21a3c6sjk226sffj9l/61544044993.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/95972078895.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49bd6ea6c---56570249982.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/laxovebexenabejoxedi.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zimafojegu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210804230826716.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ed01099d4419fda0ebad7be5adb8399/lirabetetiginenazuvafu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/629060af28c4d06174c15d2eb0d215e5/nadanupuzixasab.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55af044bbde0ad361d389e9b4aa9c3bf/fopepuvekarupewexiraw.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/85716633194.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c04cacaa---79778966071.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f975ab7508---80751014698.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 19648 bytes
SHA-256: 95eb73a76ea6ffd714c93957503a4e4a99c08ca7527110db9b1f7a00866734aa
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 11096 bytes
SHA-256: fab60fc03fcaad049bf1744d5efb4f48a606d5fa64c61a2d5400b12301864d7d
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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